Im writing my predictions here on how I think the plot will proceed.
1. She married him to get rid of her debt and she doesn't actually love him.
2. The marriage is a contract marriage.
3. They sleep in separate bedrooms and have a bad relationship behind the scenes.
4. The ML is using her amnesia to try to trick her into a real relationship.
5. The FL will initially feel suspicious but slowly fall in love.
6. Then she'll hear the truth from someone (maybe a love rival, a 2nd ML, or a close friend).
7. The ML proves to her that they were really in a relationship.
8. FL regains her memory and feels betrayed.
These predictions are based on my experience reading a lot if similar webcomics